Which indefinite article would work best in the following sentence?

on the beach, he built huge sandcastle.

a.
a

b.
an

c.
the

The essay sea stars by barbara hurd. what point is the author making by comparing a sea star missing an arm to a human losing a limb?

Which textbook section would you use to identify the books and articles the author used or referred to in writing the book? introduction bibliography index table of contents

Me answer all of these! i’m failing in ela